Here's every place you can get my books, all on one page. Pick whichever store you already use, or order the paperback straight from me for a little less.

Paperback, enlarged-type hardcover, ebook, and audiobook
$15.95 $17.95 That's $2 off the list price.
IngramSpark prints and ships your copy and handles checkout. Shipping and any sales tax are added at checkout. Orders ship to the U.S. and also to the UK (£11.99) and Australia (A$22.99), with the same discount. Ordering this way also means more of what you pay comes to me.
Amazon carries the paperback, the enlarged-type hardcover, and the Kindle ebook. Bookshop.org purchases support independent bookstores.
The audiobook is narrated by a digital clone of my own voice, and it comes with a companion PDF of the book's tables and illustrations.